An imam (/ɪˈmɑːm/; Arabic: إمام imām, plural: أئمة aʼimmah; Persian: ) is an Islamic leadership position. It is most commonly in the context of a worship leader of a mosque and Muslim community by Sunni Muslims. In this context, imams may lead Islamic worship services, serve as community leaders, and provide religious guidance. For Shi'a Muslims, the imam has a more central meaning and role in Islam through the concept of Imamah; the term is only applicable to those members of the house of the prophet ahl al-Bayt, designated as infallibles.
The Sunni branch of Islam does not have imams in the same sense as the Shi'a, an important distinction often overlooked by those outside of the Islamic faith. In everyday terms, the imam for Sunni Muslims is the one who leads Islamic formal (Fard) prayers, even in locations besides the mosque, whenever prayers are done in a group of two or more with one person leading (imam) and the others following by copying his ritual actions of worship. Friday sermon is most often given by an appointed imam. All mosques have an imam to lead the (congregational) prayers, even though it may sometimes just be a member from the gathered congregation rather than an officially appointed salaried person. Women imams may only lead amongst female-only congregations. The person that should be chosen according to Hadith is one who has most knowledge of the Quran, and Sunnah (prophetic tradition) and is of good character; the age being irrelevant.